The best type of UV protection glass that is used for automobiles is called the laminated glass. It is made of 2 layers of glass and 1 plastic layer in the middle. It is able to filter out 95-99% of UV A and B rays. But It is usually only used in the front car window.

Non-laminated glass is used for side and rear windows. They do filter most of UVB, however they allow up to 60-70% UVA to pass through.

Tinting the non-laminated glass may further reduce 15-30% of UVA. You can do that with your non-laminated glass in local auto shop but just have to make sure it allow at least 70% minimum visible light transmittance through the windshield.